Appeals to authority are fallacious if such an appeal is presented in lieu of evidence. Saying "so-and-so says" is not evidence of anything other than a third-party opinion (and like the wise man once said, opinions are like arseholes; everyone's got one and they're often full of shit). An evolutionary biologist doesn't - or shouldn't - accept evolutionary theory merely because Darwin wrote books on it, astrophysicists don't subscribe to the Big Bang theory just because Lemaître said it (and he was a Catholic priest; go figure). Basically, even the world's leading experts in their fields have to show their evidence.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
